Dear Sir/Maam,
   I am writing 
this
 letter regarding the electric heater that I purchased in your home kitchenware store Linking Words
last
 Saturday in Robinson’s Manila, on the 25th of December.
Let me explain my situation in more detail when at the store it looks seems fine but I found out that it is not functioning well when I am about to try it. Linking Words
In addition
 to Linking Words
this
, I saw a small crack in the button part. I phoned your store to informed you about the damage and I returned it back on the following day but ,Linking Words
unfortunately
 there is no available item to replace it. Add a comma
,unfortunately
However
, they told me to wait for 3 days for the replacement and until now I am not getting any response from your staff.
I would suggest and be most grateful if you could give me a full refund if you cannot replace it Linking Words
on 
Change preposition
apply
this
 week. Please look into the matter at your earliest convenience. 
I am looking forward to hearing from you.
Yours faithfully,
Peter JohnLinking Words